Help pls If a photoreceptor releasing a lot of glutamate starts to release a significantly less amount of glutamate, what is happening?AThe photoreceptor is likely a cone being exposed to a different color thanBThe photoreceptor is likely a rod being exposed to a color only identifiedwhat it is designed to respond toby conesThe photoreceptor is not receiving any lightDNone of these answers are correctEThe photoreceptor is being exposed to a decreased amount of lightFThe photoreceptor is being exposed to an increased amount of light

Option E is correct answer The photoreceptor is being exposed to decreased amount of light.

Answered: If a photoreceptor releasing a lot of…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter6: The Peripheral Nervous System: Afferent Division; Special Senses

Section: Chapter Questions

Problem 13RE

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Photoreceptors in the retina have special channels that are open to Na+ in the dark. When light hits photoreceptors, these special channels close. What can you cònclude from this? None of the above O Photoreceptors hyperpolarize to light Photoreceptors depolarize to light Photoreceptor voltage does not change in the presence of light
The absorption of light photo in photoreceptor causes a photochemical reaction in it which in away initiates the action potential so as to send an electrical signal to the brain. true O False
When waves push the basilar membrane up and down, the stereocilia move back and forth, opening up ion channels, allowing this ion to move into the hair cells and depolarizing the membrane. O CF O K* Na+ O H* O Ca* Ca+
there is profuse anastomosis between the branches of the two internal carotid arteries and the two vertebral arteries to supply to the retina O true O False
Which of the following statements comparing the LGN and the retina is correct? O Both are involved in the reconstruction (as opposed to point-by-point deconstruction) of visual stimul Both have ciells that respond to lines of a particular onentation in their receptive field. O Both get significant feedback connections (top-down infuence O Both have cells with concentric centersurraundreteptive fields O The retina has odenteand off-kenterteceptive eds, while the LGN nly tus Ton-center receptive fields
My question is The 2 types of photoreceptors cells within the retina are ______________ and _____________. These cells express a specialized G-protein coupled receptor which converts light into an electrical signal through the isomerization of ________________.
When norepinephrine binds to alpha1 receptors on the smooth muscle of the iris, the pupil _____. Question options: A constricts B dilates
Select the most appropriate structure that fits the best in the paragraph. a. pupil b. spinal cord c. optic chiasma d. cauda equina e. prefrontal cortex f. retina g. ventral h. visual cortex I. primary motor cortex j. cones k. dorsal L. lateral geniculate nucleus m. premotor area n. rods О. Broca p. visual association area q. optic tract r. bipolar cells s. medial geniculate nucleus t. Optic
How are Ca2+ channels involved in phototransduction? they cause neurotransmitter release even if no action potentials are produced are not affected by PDE activation in the outer segments when open, they lead to hyperpolarization in photoreceptors in darkness, they do not rely on CGMP levels The density of cones in the retina: is highest where cone outer segments increase in diameter is lowest where retinal blood vessels are absent is drastically less than that of rods in the fovea is indicative of what areas are associated with acuity The recycling of rhodopsin.
The lens tends to harden with age. This would make it difficult to focus on nearby objects make it harder for light to reach the photoreceptor cells increase the pressure on the retina causing blindness
In vision, The sympathetic system stimulates the ciliary muscle to contract resulting in decreased tension of zonal fibers on the lens Astigmatism occurs as a result of an eye that is too long Rods release more neurotransmitter when transducin is not activated by the dissociation of retinal and opsin Rods are concentrated in the fovea
Tactile receptors include all the following receptors, except :-a- free nerve endingsb- hair follicle receptorsc- hair cell receptorsd- Ruffini nerve endings

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